Download MendeleyStructural characterization of the mitomycin 7-O-methyltransferase.
Singh, S., Chang, A., Goff, R.D., Bingman, C.A., Gruschow, S., Sherman, D.H., Phillips, G.N., Thorson, J.S.(2011) Proteins 79: 2181-2188
- PubMed: 21538548
- DOI: https://doi.org/10.1002/prot.23040
- Primary Citation of Related Structures:
3GWZ, 3GXO - PubMed Abstract:
Mitomycins are quinone-containing antibiotics, widely used as antitumor drugs in chemotherapy. Mitomycin-7-O-methyltransferase (MmcR), a key tailoring enzyme involved in the biosynthesis of mitomycin in Streptomyces lavendulae, catalyzes the 7-O-methylation of both C9β- and C9α-configured 7-hydroxymitomycins. We have determined the crystal structures of the MmcR-S-adenosylhomocysteine (SAH) binary complex and MmcR-SAH-mitomycin A (MMA) ternary complex at resolutions of 1.9and 2.3 Å, respectively. The study revealed MmcR to adopt a common S-adenosyl-L-methionine-dependent O-methyltransferase fold and the presence of a structurally conserved active site general acid-base pair is consistent with a proton-assisted methyltransfer common to most methyltransferases. Given the importance of C7 alkylation to modulate mitomycin redox potential, this study may also present a template toward the future engineering of catalysts to generate uniquely bioactive mitomycins.
Organizational Affiliation:
Division of Pharmaceutical Sciences, Wisconsin Center for Natural Product Research, School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA.
